penumbra

/pษ™หˆnสŒmbษนษ™/

IPA: /P IH0 N AH1 M B R AH0/

noun
  1. 1

    A partially shaded area around the edges of a shadow, especially an eclipse.

  2. 2

    A region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot.

  3. 3

    An area of uncertainty or intermediacy between two mutually exclusive states or categories.

  4. 4

    An area that lies on the edge of something; a fringe.

  5. 5

    Something related to, connected to, and implied by, the existence of something else that is necessary for the second thing to be full and complete in its essential aspects.

  6. 6

    (in "ischaemic penumbra", after a stroke) A region of the brain that has lost only some of its blood supply, and retains structural integrity but has lost function.

Source: https://en.wiktionary.org/wiki/penumbra